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Below a summary of typical milling additions to wet applied porcelain/vitreous enamels and their function(s).
Milling Addition | Function |
Aerosil | for set-up |
Aluminium oxide | matting agent and to increase heat resistance of ground coat |
Aluminium hydroxide | equivalent to aluminium oxide |
Aluminium powder | increase heat resistance in ground coat |
Antimony trioxide | increase adherence of ground coat |
Barium chloride | for set-up in cover coat |
Barium carbonate | for set-up in cover coat |
Bentonite | for set-up |
Borax | for set-up in ground coat |
Boric acid | for set-up |
Cadmium oxide | to stabilise Cd-Se red enamels |
Clay | provide bubble structure |
Cupric chloride | for self lustre enamel 1118 |
EK-1000 | for continuous clean enamel |
Feldspar | for ground coat |
Gumst | increase filmstrength |
Magnesium chloride | for set-up cover coat |
Magnesium nitrate | to increase suspension and to prevent fishscales |
Opacifier UV | opacifier |
Potash | for set-up |
Potassium choride | for set-up cover coat |
Potassium nitrate | oxidizing agent for aluminium enamels |
Quartz | to increase firing range and matting agent |
Silicic acid | for set-up |
Silver sand | for heat resistant ground coat |
Soda ash | for set-up in ground coat |
Sodium aluminate | for set-up in cover coat |
Sodium nitrite | for set-up in ground coat |
Sodium pyrophosphate | to decrease set-up |
Sodium silico fluoride | for set-up cover coat |
Tinoxide | opacifier |
Titanium dioxide | opacifier |
Trisodium phosphate | to prevent rusting in cast iron ground coat |
Urea | to prevent hairlines in cover coat |
Zirconite | opacifier |
Zircon oxide | opacifier |
More info about milling addition may be found in the following manuals :
Excellent reference book with 870 pages & hardcover about the preparation, application & properties of enamels ! Contains everything you want to know about : - The history of enameling - Raw materials for enamels - Fundamental considerations - Metalic substrate for enameling - Preparation of the metal surfaces for enamelling - Enamel...
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